Electric lamp



April 23, 1946. G. c. Smm v 2,398,968"

ELECTRIC LAMP Filed Sept. l5, 1:944

Patented pr. 23, 194% UNITED STATES PATENT OFFICE 2,398,968 ELECTRICLAMP l Grover C. Singer, Brownsville. Tex.

Application September 15, 1944, Serial No. 554,247 2 Claims. (Cl.176-37) This 'invention relates to electric lamps.

An object of the invention is the provision of an electric lamp having abulb formed integrally with the base and composed of transparentmaterials, the base being provided with an axial passage connecting theinterior of the bulb with the exterior, a plug sealed within the passageand carrying embedded lead-in Wires with filaments attached theretoforming an insertible unit.

Another object of the invention is the provision of an electric lamphaving a bulb formed integrally with the base member' and composed oftransparent materials, the base being provided with an axial passageadapted to receive a plug which is hermetically sealed to the walls ofthe passage, the inner end of the plug being provided with a reflectorwith lead-in wires em=- bedded in the plug and having their inner endsprojecting into the interior of the bulb, filaments being connected topairs of the lead-in wires with one filament being located outwardly oflthe other filament, the plug, lead-in wires and filaments forming aunit which is received within. the bulb and passage in the base member.

A further object ofthe invention is the provision of an electric lamphaving a bulb and base member formed integrally and composedoftransparent materials, the base member being provided with a wideaxial passage to receive a plug which is hermetically sealed to thewalls of the passage said plug having a pocket at its inner end withlaments disposed in the pocket, said filaments being carried by lead-inwires which are embedded in the plug, the bottom of .the pocket beingcurved and provided with a reflecting surface.

This invention willl be best understod from a consideration of thefollowing detailed description, in View of the accompanying drawingforming a part of the specification; nevertheless, it is to beunderstood that .the invention is not con'lned to the disclosure, beingsusceptible of such changes and modifications as define no materialdeparture from the salient features of the invention as expressed in theappended claims.

In the drawing:

Fig. 1 is a vertical section of one form of an electric lamp constructedaccording to the principles of my invention.

Fig. 2 is an enlarged view in elevation of a prong which projects fromthe base of the lamp.

Fig. 3 is a vertical section of a modiiied form -of the lamp shown inFig. l.

Fig. 4 is a fragmentary plan viewv of the laments and removable plugmounted within the bulb and base of the lamp, shown in Fig. 3.

Fig. 5 is a vertical section of another form or the lamp.

Referring more particularly. to the drawing (Fig. 1), it designates abulb which is formed of glass. The bulb is provided with a front Wall Il, which has the outer face corrugated as shown at I2. A base member i@is also formed of transparent materials and is cast integrally with thebulb it.

The base i3 is provided with a, central passage is which connects theinterior of the bulb with the exterior. 1t will be4 noted that thepassage id has a relatively' large diameter.

A plug i5 is received within the passage ld and is adapted to be sealedto the walls of the passage for hermetically closing the bulb l to theatmosphere. The plug i is provided with an axial passage it and thispassage is employed for exhausting the air from the bulb i0 after whichthe outer end of the passage is closed by any suitable form of cement asshown at il.

Three lead-in wires, 2b, 2i and 22 are embedded in the plug l5 with theinner ends of the Wires projecting into the bulb i. Filaments 23 and itare connected to the inner ends of the lead-in wires in any approvedmanner. The

. outer ends of the lead-in wires as shown at 25,

2t and @l are bent fiat against the outer end of the base it and theseends are secured within the openings 28 (Fig. 2). in an associatedprong. In other words, the portion 25 of the lead-in wire 20 isconnected to a prong 29 while the bent end of the wire 22 is connectedto a prong 3Q. The outer end of the wire 23 is connected to the prongsi. .Any number of lead-in wires may be employed for supporting morethan two filaments. In other words, lead-in wires 2t, 2! and 22 maysupport the iilarnents 23 and 2Q at one side of a vertical plane passingthrough the longitudinal axis of the plug i5 while a similar number oflead-in wires for filaments may be mounted at the other side of saidvertical plane.

The plug l5 is provided with an annular groove 2 aseaece when hardenednot only cements the prongs in' position but hernietically seals theplug in position.

The inner-end of the plug l5 is curved and is covered with a reflectingmaterial 3l. The inner side walls of the bulb l are also covered withreflecting material as shown at 8e. A patch of reflecting material 39 islocated on the inner face of the member ll directly above the laments 23and g2@ in order to cut down the glare from the headlight since the raysfrom the iilaments are reflected back into the bulb and against thereflecting surface Bilanci these rays are modified before theyv areprojected from the bulb.-

It'will be noted' from this construction that the plug l5 together withthe lead-in wires and the filaments form a unit so that the plug may beinserted into the passage l s and hermetically sealed thereto.

Referring more particularly to Fig. 3, a. plug d@ is sealed within thepassage 4l by a cement or a plastic with the plastic 42 in the groovesd3 and dd not only aiding in securing the plug d0 in position but forsecuring prongs 5, d6 and di in position. The plug d is provided with acentral passage d8 through which the air may be withdrawn from the bulblila when the lamp hasv been completed. The outer end of the passage isclosed by the usual form of cement 49.

The inner end of the plug Il!) extends into the surface indicated at l2has less area than the patch of reflecting surface shown in Fig. l. Thisbulb la with the inner end of the plug having A pair of lead-in wiresand 6I are likewise embedded in the base 40 but the outwardly curvedends 52 and 53 respectively of the wires 60 and 5| are disposed adjacentthe inner end of the plug 40 and carrying affilament 64. When theniaments 5l and 64 are illuminated a strong light is projected from thebulb. On the other hand the vilament 54 may be dimmedl or cut out sothat the lament SI will supply the illumination which provides a. saferdriving light. A patch of reilecting material 65 is secured to the innerface of the closure 55 and is located directly above the filament 64 sothat rays from the lament will be reflected back before said rays areprojected into the atmosphere in order to prevent too great a diffusionof the light from the ilaments.

Referring more particularly to Fig. 5 it will be seen that the bulb Iband the base 10 are substantially the same as the bulb and base shown inFigs. l and 3. The only distinction is the different type of plug Ilwhich is employed. The inner face of the bulb is provided with substanltially the same reecting surface asv shown in is due to the fact thatthe ilament 'is and the plug 'H are confined in a smaller area.

The plug H is inserted in the passage ld and sealed to the walls of thepassage as are the plugs 'l5 and dil. The annular grama 5 in the base'lll is identical in construction as that shown in Figs. 1 and 2, butthe groove le has a substantially smaller crosssectional area. Prongs iland i3 are likewise employed and secured in place by a cement or plasticwhich is applied to the grooves l5 and 'l5 and to the outer wall of theplug li.

The inner end of the plug ll extends into the bulb lb and is providedwith a pocket which has a convex bottom wall Si which is covered withreflecting material as shown at 82.

Lead-in wires 83 and 84 are embedded in the plug ll and project into thepocket 80 for supporting the lament 73. While two lead-in wires only areshown it will be appreciated that any number may be employed for thepurpose to Support a plurality of filaments. The outer ends of thelead-in wires 83 and S are bent iiat against the outer end of the plug'H and are connected with the respective prongs 'Il and 18 in the samemanner as has been described above.

In Fig. 2 is shown an enlarged view of a prong detached from the basemember i3. It will be noted that the inner end 85 of this prong isroughened so that when the cement or plastic is applied to the same theroughness will aid in preventing ready release of the prongs.

The outer end of the prongs is not only provided witha small opening 28but with a larger opening 86 in which is connected a wire or otherconnection to the usual source of current.

I claim:

l. An electric lamp comprising a bulb, a base formed integrally with thebulbv and composed of transparent materials, the base having an axialpassage, a plug fitted into the passage, lead-in wires embedded in theplug and projecting into the bulb, nlam'ents attached to the inner endsof the lead-in wires, the walls of the passage and the plug beingprovided with facing grooves. metal prongs located between the plug andwalls of said passage and extending from the grooves to points outwardlyof the plug. and a'sealing means lling the grooves for not onlyhermetically attaching the plug to the base but for securing the prongsin position. l V

2. An electric lamp comprising a bulb, a base formed integrally with thebulb and composed of transparent materials, the base having an axialpassage.' a plug fitted into theA passage, :lead-in wires embedded inthe plus and projecting into prongs located between the plug `and wallsof said passage vand extendingfrom .the grooves to points outwardly.oi'V the plug, and a sealing means filling the grooves for not onlyhermetically attaching the plug to the base but f or'seeuring the prongsin position,"the inner end of the plug-being curved projecting intoth-bulb and Drovidec with a reflectingsurface thereon. l

' GROVER C. SINGER.

